.cover {
    height:100%;
    overflow: hidden;
    position:relative;
}
/*menu*/
.menu {
    position:absolute;
    right: 10px;
    top: 10px;
    z-index: 1;
}
.menu button {
    background: none;
    border: none;
    height: 36px;
    margin: 0 8px;
    transition: opacity .6s;
    opacity: .7;
    padding: 0;
    width: 36px;
}
#wechat {
    background-size: 36px;
    background-image: url(../../assets/img/img.png);
    background-repeat: no-repeat;
    background-position: 0 -26px;
}
#weibo {
    background-size: 36px;
    background-image: url(../../assets/img/img.png);
    background-repeat: no-repeat;
    background-position: 0 -63px;
}
#email {
    background-size: 54px;
    background-image: url(../../assets/img/img.png);
    background-repeat: no-repeat;
    background-position: 0 0px;
}
.menu button:hover {
    opacity: 1;
}
.menu a{
    background-color: transparent;
}
/*video*/
.video-container {
    height:100%;
    position: absolute;
    width: 100%;
    z-index: -100;

}
video {
    left: 50%;
    min-height: 100%;
    min-width: 100%;
    position: absolute;
    transform: translateX(-50%);
}
/*content - enter*/
.content div {
    left: 50%;
    position: absolute;
    transform: translate(-50%,-50%);
}
.enter{
    height: 52px;
    margin-top: 120px;
    top: 63%;
}
.enter p{
    margin: 0;
    position: absolute;
    font-size: 14px;
    text-align: center;
    pointer-events: none;
    color: #fff;
    top: 0;
    width: 100%;
    height: 100%;
    line-height: 52px;
    letter-spacing: 4px;
}
.content button{
    background: none;
    border: none;
    height: 53px;
    margin: 0 14px;
    opacity: .4;
    -webkit-transition: opacity .3s;
    transition: opacity .3s;
    width: 220px;
    cursor: pointer;
}
.content button:hover {
    opacity: 1;
}
#enter-btn {
    background-image: url(../../assets/img/enter.png);
    background-position: 0 0;
    background-repeat: no-repeat;
    background-size: 642px;;
}
.content a{
    text-decoration: none;
    background-color: transparent;
}
/*content-logo*/
.logo {
    background-image: url(../../assets/img/enter.png);
    background-repeat: no-repeat;
    background-size: 642px;
    background-position: 0 81.02435%;
    height: 225px;
    top: 35%;
    width: 180px;
}
/*content-intro*/
.intro {
    background-position: 0 55.5773%;
    height: 54px;
    top: 60%;
    width: 351px;
    background-image: url(../../assets/img/enter.png);
    background-repeat: no-repeat;
    background-size: 642px;
}

/*curtain*/
.curtain {
    background: rgba(0,0,0,.4);
    height: 100%;
    position: absolute;
    width: 100%;
    z-index: -10;
}